Amphibious polymer-functionalized CdTe quantum dots: Synthesis, thermo-responsive self-assembly, and photoluminescent properties

作者：Zhou, Li; Gao, Chao^*; Xu, Weijian

来源：Journal of Materials Chemistry, 2009, 19(31): 5655-5664.

DOI：10.1039/b905966k

• MULTIWALLED CARBON NANOTUBES
• SEMICONDUCTOR NANOCRYSTALS
• INITIATED POLYMERIZATION
• WEAK POLYELECTROLYTES
• GOLD NANOPARTICLES
• CDS NANOCRYSTALS
• II-VI
• TEMPERATURE
• LUMINESCENT
• LIGHT

A straightforward strategy is presented to functionalize aqueous-phase synthesized CdTe quantum dots (QDs) with thermo-sensitive poly(2-(dimethylamino) ethyl methacrylate) (PDMAEMA) via direct surface-initiated oxyanionic vinyl polymerization. The polymer grafting quantity can be facilely controlled in a wide range up to 95.2wt% by adjusting the weight feed ratio of monomer to pristine QDs. The polymer-grafted QDs still retain good fluorescence properties in solution, solid polymer matrix, and on surfaces of silica (SiO2) sphere. The resulting QD@PDMAEMAs show excellent solubility both in water and organic solvents (e. g., chloroform, dichloromethane, dioxane, ethyl acetate, acetone, methanol, and N, N-dimethylformamide). We have called them amphibious QDs. The thermo-sensitive PDMAEMAs make QDs accessible to self-assemble reversibly by adjusting temperature when the grafted polymer content is over a certain value. The self-assembly process and resulting structure were demonstrated by TEM, variable temperature dynamic light scattering (DLS) and UV-vis spectrometer. Because PDMAEMA is a kind of positive polyelectrolyte, QD@ PDMAEMAs were used as building blocks in the layer-by-layer self-assembly process on the surface of SiO2 spheres, affording fluorescent SiO2 spheres.

• 出版日期2009
• 单位湖南大学; 浙江大学